I've been shooting the norma TAC-308, allegedly their match ammo for auto loading guns. I'm only shooting it because I picked it up for $0.63 per round (cheaper than empty norma brass!!). I have no problem putting 5 under an inch, but my bolt action 308 has done that with everything I've ever put through it. I will say that the norma TAC-308 is a far, far cry from Black Hills or FGMM. I'd guess it's primarily because of the 155gr bullets that are used, as opposed to the 168 or 175's used in bolt gun match ammo.